spring ConstructorArgumentEntry 源码
spring ConstructorArgumentEntry 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/factory/parsing/ConstructorArgumentEntry.java
/*
* Copyright 2002-2012 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.beans.factory.parsing;
import org.springframework.util.Assert;
/**
* {@link ParseState} entry representing a (possibly indexed)
* constructor argument.
*
* @author Rob Harrop
* @author Juergen Hoeller
* @since 2.0
*/
public class ConstructorArgumentEntry implements ParseState.Entry {
private final int index;
/**
* Creates a new instance of the {@link ConstructorArgumentEntry} class
* representing a constructor argument with a (currently) unknown index.
*/
public ConstructorArgumentEntry() {
this.index = -1;
}
/**
* Creates a new instance of the {@link ConstructorArgumentEntry} class
* representing a constructor argument at the supplied {@code index}.
* @param index the index of the constructor argument
* @throws IllegalArgumentException if the supplied {@code index}
* is less than zero
*/
public ConstructorArgumentEntry(int index) {
Assert.isTrue(index >= 0, "Constructor argument index must be greater than or equal to zero");
this.index = index;
}
@Override
public String toString() {
return "Constructor-arg" + (this.index >= 0 ? " #" + this.index : "");
}
}
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